Should be 10mm or 3/8ths Actually, it turned out to be 7mm Allen wrench.
To tighten and loosen Allen head bolts
The caliper bolts can be accessed from the rear of the caliper. After removing the tire you can view the recessed brake caliper bolts. You will need a large Allen wrench, as these are Allen head bolts. Consult your auto parts store for the proper size Allen wrench. Common toolbox wrenches will be far too small. I would advise to spray down with some WD-40 the night before. You should also make available a large hammer to hit the wrench and loosen the bolts, as it is an akward position to muscle the bolt free with a short wrench.
The Allen wrench size for the front caliper slide pin bolts is 3/8".
9mm Allen wrench
A 3/8" Allen wrench is used to r&r the caliper bolts.
Metric Allen wrench.
I believe it is a 7mm hex.
Loosen and remove the caliper retaining bolts. Torx T-40 or T-45
A 3/8" Allen wrench.
the front calipers take a 9 mil Allen head and the rear take a 7 mil, noth arent in your average homeowner Allen set
the caliper bolts require a 3/8" Allen wrench. You can buy these as a socket at just about any parts store.
use an Allen wrench not a socket or open or box wrench.
You need a 3/8" Allen wrench to remove them.
The front caliper on a 1995 Ram is requires a 3/8 inch Allen wrench to remove the bolts.
It should be a 3/8" Allen wrench.
"Caliper anchor bolts" hold the brake caliper on, they require a 3/8" Allen wrench to remove.
9mm hex socket bit
Bolts on the caliper of a 1999 Monte Carlo will loosen to the left and tighten to the right.
Most likely a 3/8 Allen, but 15 mm wrench is possible.
Try 3/8 Allen key , or 15 mm wrench.